Device and Method for Wireless Channel Access

1. A method for wireless channel access, executable by a device, comprising: determining a wireless communication service to be performed through a contention-based random access operation; selecting a service-based energy detection threshold associated with the wireless communication service; and using the selected service-based energy detection threshold to perform energy detection in the contention-based random access operation to obtain an unlicensed band for the wireless communication service; wherein the contention-based random access operation is a listen-before-talk operation; wherein the selecting further comprises: selecting a first prioritized energy detection threshold associated with latency-critical communication service as the selected service-based energy detection threshold for transmission of latency-critical communication traffic; and selecting a second prioritized energy detection threshold associated with non-latency-critical communication service as the selected service-based energy detection threshold for transmission of non-latency-critical communication traffic; further comprising: associating a dedicated priority class with a latency-critical communication service; wherein the dedicated priority class comprises a channel access priority class (CAPC); further comprising: determining a minimum time TLBTmin for performing the listen-before-talk operation; wherein the minimum time TLBTmin for performing the listen-before-talk operation is derived from a plurality of parameters including the CAPC.

2. The method of claim 1, wherein the listen-before-talk operation is used to access a new radio unlicensed band.

3. The method of claim 1, wherein minimum time TLBTmin for performing the listen-before-talk operation is derived according to the formula: TLBTmin=Tf+(mp+N)·Tsl wherein Tf is a constant duration, Tsl is a sensing slot duration, the mp is a number of consecutive sensing slots according to the CAPC, and N is a counter for counting slots for sensing channel energy.

4. The method of claim 3, wherein a domain of the CAPC comprises more than four CAPCs.

5. The method of claim 1, wherein the latency-critical communication service comprises ultra reliable low latency communication (URLLC).

6. The method of claim 5, wherein the service-based energy detection threshold is selected by the device serving as a transmitter.

7. The method of claim 5, wherein the service-based energy detection threshold is explicitly indicated by radio resource control (RRC) signaling.

8. A device, comprising: a transceiver; and a processor connected with the transceiver and configured to execute the following steps comprising: determining a wireless communication service to be performed through a contention-based random access operation; selecting a service-based energy detection threshold associated with the wireless communication service; and using the selected service-based energy detection threshold to perform energy detection in the contention-based random access operation to obtain an unlicensed band for the wireless communication service; wherein the contention-based random access operation is a listen-before-talk operation; wherein the selecting further comprises: selecting a first prioritized energy detection threshold associated with latency-critical communication service as the selected service-based energy detection threshold for transmission of latency-critical communication traffic; and selecting a second prioritized energy detection threshold associated with non-latency-critical communication service as the selected service-based energy detection threshold for transmission of non-latency-critical communication traffic; wherein the processor is further configured to execute the step of: associating a dedicated priority class with a latency-critical communication service; wherein the dedicated priority class comprises a channel access priority class (CAPC); wherein the processor is further configured to execute the step of: determining a minimum time TLBTmin for performing the listen-before-talk operation; wherein the minimum time TLBTmin for performing the listen-before-talk operation is derived from a plurality of parameters including the CAPC.

9. The device of claim 8, wherein the listen-before-talk operation is used to access a new radio unlicensed band.

10. A chip, comprising: a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of claim 1.